From Glitch City Laboratories

The term equivalent trade glitch Pokémon refers to any one of two or more glitch Pokémon which share the same hexadecimal identifier. 'M for example, when transferred to Pokémon Yellow will become 3TrainerPoké; meaning 3TrainerPoké is an equivalent trade glitch Pokémon of 'M (00) and 'M is an equivalent trade glitch Pokémon of 3TrainerPoké.

Between games such as Red/Blue->Yellow, Red/Green->Blue and Red/Green-> Yellow, equivalent trade glitch Pokémon are often completely different, due to changes in the game code.

Trading a glitch Pokémon from one version to another is an ideal way of obtaining certain glitch Pokémon.

Examples of where equivalent trading is useful

1. 3TrainerPoké (hex:00) in Pokémon Yellow can easily be obtained by trading an 'M (00) over from Pokémon Red and Blue. 'M can easily be caught on Pokémon Red and Blue via the Old Man Trick, while 3TrainerPoké is harder to obtain without trading in Pokémon Yellow, as a glitch such as the remaining HP glitch or Time Capsule exploit, or possibly arbitrary code execution must be used.

2. As Red/Blue's PokéWTrainer (index number 196) always freezes the game on the opponent's side, the Ditto Trick cannot be used to obtain it. In Pokémon Yellow, X ゥ- xゥ, has the same index number and does not freeze the game on the opponent's side, so the player can obtain it with the Ditto Trick and trade it over to Red/Blue to obtain PokéWTrainer.